Packaging with a break line and method for manufacturing the same

Abstract

The invention is directed to packaging comprising a multiple-layer material construction with a break line which is formed by a line-shaped, successive arrangement of blind holes separated by webs and in which the multiple-layer material construction comprises at least one layer which absorbs laser radiation and a layer which reflects this laser radiation. A radiation-absorbing layer forms the surface layer of the packaging, and the blind holes of the surface layer extend into the packaging until the reflecting layer, and the web widths are substantially constant over the depths of the blind holes so that there are abrupt jumps in material thickness along the break line, and a clearly audible noise is generated when these jumps in material thickness are overcome when the break line tears. The invention is further directed to a method for producing packaging of this kind.

1 - 7 . (canceled)  
   
   
       8 . Packaging comprising a multiple-layer material construction with a break line which is formed by a line-shaped, successive arrangement of blind holes separated by webs, wherein the multiple-layer material construction comprises: 
 at least one layer which absorbs a laser radiation and a layer which reflects this laser radiation, wherein a radiation-absorbing layer forms the surface layer of the packaging;    said surface layer having blind holes which extend into the packaging until the reflecting layer;    web widths being substantially constant over the depths of the blind holes so that there are abrupt jumps in material thickness along the break line; and    a clearly audible noise being generated when these jumps in material thickness are overcome when the break line tears.    
   
   
       9 . Packaging according to  claim 8 , wherein the material layers with high tear strength are arranged before the reflection layer with respect to the surface layer.  
   
   
       10 . Packaging according to  claim 8 , wherein all of the material layers which, as per their function, must not be arranged after the reflection layer with respect to the surface of the packaging are arranged before the reflection layer.  
   
   
       11 . Packaging according to  claim 8 , wherein the tear strength of the webs is as high as possible in relation to the tear strength of the break line, and the tear strength of the material (residual wall) remaining below the bases of the blind holes in relation to the tear strength of the break line is as small as possible in order to achieve a maximum difference in tear strength between the webs and the residual walls so as to increase the loudness of the noise.  
   
   
       12 . Packaging according to  claim 8 , wherein the blind holes are generated by laser so that a bead of melted material occurs around the rim of the blind holes, which contributes to increasing the tear strength of the webs.  
   
   
       13 . A method for generating a break line in multiple-layer packaging material, which break line causes a noise, comprising the steps of: 
 providing at least one layer which absorbs a laser radiation and a layer (reflection layer) which reflects this laser radiation, wherein a radiation-absorbing layer forms the surface layer of the packaging; and    guiding a laser beam along the provided break line relative to the surface of the packaging so that a line-shaped, successive arrangement of blind holes separated by webs is formed; and    permitting the laser beam to continue to act after impinging on the reflection layer until the base of the blind hole has undergone an expansion which at least approximates the expansion of the blind hole in the surface layer so that the increase in the web width is reduced along the depth of the blind holes.    
   
   
       14 . The method according to  claim 13 , wherein the laser beam acts in a regulated manner after impinging on the reflection layer.